It's like picking baseball and describing it. How to practice, how to play what material/equipment you need... I hope that helps.
1.) who
2.) why
3.) whose
4.) what, how
5.) that
6.) why
7.) whether
8.) when
9.) what
I hope you can use words over again in this case. Let me know if you need explanations!
It is the main central idea. Such as hope, fear, etc.